K4Fe4P5O20: A New Mixed Valence Microporous Compound with Elliptical Eight-Ring Channels
K4Fe4P5O20: A New Mixed Valence Microporous Compound with Elliptical Eight-Ring Channels
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K4Fe4P5O20：一种新型椭圆八环通道混合价微孔化合物
DOI：
10.1021/ic301245c
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发表时间：
2012
影响因子：
4.6
通讯作者：
Zhangzhen He
中科院分区：
文献类型：
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作者：
Y. Mizuno;M. Okubo;K. Kagesawa;D. Asakura;T. Kudo;H.S. Zhou;K. Oh-ishi;A. Okazawa;N. Kojima;Hiromichi Ida;Zhangzhen He
在密闭坩埚中采用常规固相反应法制备了一种新型小孔化合物k4fe4p5o20。晶体结构由fe4p5o20单元沿轴形成的链和平面上的椭圆形八环通道组成，其中K阳离子位于其中。这种结构特征似乎与钠橄榄岩家族的结构特征非常相似。然而，k4fe4p5o20中的铁离子具有三角-双锥体配位，而不是普通的四面体配位。此外，我们的实验结果结合磁化率和57fe Mössbauer光谱测量结果表明，标题材料中存在混合价态的Fe3+/Fe2+。据我们所知，这是第一个在所谓的钠沸石框架中含有混合价铁离子的例子。
A new small-pore compound K4Fe4P5O20was obtained by conventional solid-state reaction in a closed crucible. The crystal structure is constructed by Fe4P5O20units forming chains along thecaxis and elliptical eight-ring channels on thea–bplane in which K cations locate inside. Such structural characteristics seem to be quite similar to those seen in the natrolite family. However, Fe ions in K4Fe4P5O20have trigonal–bipyramidal instead of common tetrahedral coordination. Furthermore, our experimental results combined from magnetic susceptibility and57Fe Mössbauer spectrum measurements show mixed valence Fe3+/Fe2+in the titled material. To the best of our knowledge, this is the first example that contains mixed valence iron ions in a so-called natrolite framework.